General Anderson thought Mahone was a fantastic brigade commander and recommended him for division command as early as the spring of 1863...
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General Longstreet thought Brigadier General Mahone distinguished for skill and gallantry on May 6, 1864. During his convalescence for serious wounds received that day, Longstreet expressed to the Confederate high command shortly after that Mahone had in his eyes won his spurs for promotion to division command (which at the time of Longstreet's writing, he held, commanding Anderson's division after Longstreet's evacuation):
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It is true that at the moment of assuming command of Andersons' division Mahone was the senior brigadier...
Mahone, Nov. 16, 1861.
Wright, June 3, 1862.
Perry, Aug. 28, 1862.
Perrin, Sept. 10, 1863.
Harris, Jan. 20, 1864.
But Mahone was soon promoted to Major General (temporary rank) in June, which he declined. He was promoted to Major General on August 3, to rank from July 30, 1864.
When Lee appointed R.H. Anderson to command Longstreet's corps on May 7, 1864, Early outranked Anderson. Early's commission as major general ranked from January 17, 1863...
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Anderson's commission as Major General ranked from July 14, 1863...
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However, it is likely that Gen. Lee was at that time aware of the failing condition of Gen. A.P. Hill commanding the third corps. And on the 8th of May, General A.P. Hill of the third corps was evacuated for illness, and Maj. Gen. Early of the second corps assigned to command that corps temporarily. Both generals Early and R.H. Anderson were shortly commissioned lieutenant generals (temporary) to rank from May 31, 1864.
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The Temporary rank only held while holding the commands assigned them which called for it.
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Lt. Gen. Early was relieved from command in the valley on March 30, 1865...
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And Lt. Gen. Anderson relieved of corps command on April 8, 1865...
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So it would appear both were major generals at the collapse of the Confederacy... as was Mahone, who commanded a division with Lee to the end at Appomattox.
When Gen. Longstreet was wounded and disabled at the Wilderness on May 6, 1864, General Anderson was not a part of his corps, but commanded a division in Hill's third Corps. Rather than demote him back to division command in October when Longstreet returned, Lee gave Anderson command of the fourth corps of the Army of Northern Virginia (formerly Beauregard's late command) with the temporary lieutenant-generalcy.
Anderson's division command record on the battlefield had evidently informed his commanders of his fitness for promotion. He first commanded a division in the Army of Northern Virginia at the battle of Seven Pines, where he commanded Longstreet's division (Longstreet commanding a wing of the army)... Longstreet reported...
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He was subsequently promoted to major general and given command of a division (formerly Huger's). After Second Manassas and Antietam, he was the first named of the most distinguished officers under Longstreet's command in his official report...
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At Chancellorsville, he was among the few distinguished officers mentioned by name in General Lee's official report...
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Regarding Gettysburg, Anderson and his division did a great deal of fighting on July 2. But perhaps more notably regarding Anderson personally, Gen. Mahone says he was among those officers who had no interest in joining the chorus of officers second guessing General Lee's orders regarding the attack on July 3. Gen. Mahone recalled...
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During the attack, Anderson's division was prepared to advance and support any success by Pickett's division, etc. He received the word to advance, and commenced doing so, when halted on the order of General Longstreet, who perceived that the attack had failed. From Longstreet's report...
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Anderson's last combat as a division commander was at the Wilderness during May 5-6, 1864.